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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.search.aggregations.metrics.cardinality;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.ObjectParser;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.index.query.QueryParseContext;
import org.elasticsearch.search.aggregations.AggregationBuilder;
import org.elasticsearch.search.aggregations.AggregatorFactories.Builder;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.support.ValueType;
import org.elasticsearch.search.aggregations.support.ValuesSource;
import org.elasticsearch.search.aggregations.support.ValuesSourceAggregationBuilder;
import org.elasticsearch.search.aggregations.support.ValuesSourceConfig;
import org.elasticsearch.search.aggregations.support.ValuesSourceParserHelper;
import org.elasticsearch.search.aggregations.support.ValuesSourceType;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.Objects;
public final class CardinalityAggregationBuilder
extends ValuesSourceAggregationBuilder.LeafOnly<ValuesSource, CardinalityAggregationBuilder> {
public static final String NAME = "cardinality";
private static final ParseField REHASH = new ParseField("rehash").withAllDeprecated("no replacement - values will always be rehashed");
public static final ParseField PRECISION_THRESHOLD_FIELD = new ParseField("precision_threshold");
private static final ObjectParser<CardinalityAggregationBuilder, QueryParseContext> PARSER;
static {
PARSER = new ObjectParser<>(CardinalityAggregationBuilder.NAME);
ValuesSourceParserHelper.declareAnyFields(PARSER, true, false);
PARSER.declareLong(CardinalityAggregationBuilder::precisionThreshold, CardinalityAggregationBuilder.PRECISION_THRESHOLD_FIELD);
PARSER.declareLong((b, v) -> {/*ignore*/}, REHASH);
}
public static AggregationBuilder parse(String aggregationName, QueryParseContext context) throws IOException {
return PARSER.parse(context.parser(), new CardinalityAggregationBuilder(aggregationName, null), context);
}
private Long precisionThreshold = null;
public CardinalityAggregationBuilder(String name, ValueType targetValueType) {
super(name, ValuesSourceType.ANY, targetValueType);
}
/**
* Read from a stream.
*/
public CardinalityAggregationBuilder(StreamInput in) throws IOException {
super(in, ValuesSourceType.ANY);
if (in.readBoolean()) {
precisionThreshold = in.readLong();
}
}
@Override
protected void innerWriteTo(StreamOutput out) throws IOException {
boolean hasPrecisionThreshold = precisionThreshold != null;
out.writeBoolean(hasPrecisionThreshold);
if (hasPrecisionThreshold) {
out.writeLong(precisionThreshold);
}
}
@Override
protected boolean serializeTargetValueType() {
return true;
}
/**
* Set a precision threshold. Higher values improve accuracy but also
* increase memory usage.
*/
public CardinalityAggregationBuilder precisionThreshold(long precisionThreshold) {
if (precisionThreshold < 0) {
throw new IllegalArgumentException(
"[precisionThreshold] must be greater than or equal to 0. Found [" + precisionThreshold + "] in [" + name + "]");
}
this.precisionThreshold = precisionThreshold;
return this;
}
/**
* Get the precision threshold. Higher values improve accuracy but also
* increase memory usage. Will return <code>null</code> if the
* precisionThreshold has not been set yet.
*/
public Long precisionThreshold() {
return precisionThreshold;
}
/**
* @deprecated no replacement - values will always be rehashed
*/
@Deprecated
public void rehash(boolean rehash) {
// Deprecated all values are already rehashed so do nothing
}
@Override
protected CardinalityAggregatorFactory innerBuild(SearchContext context, ValuesSourceConfig<ValuesSource> config,
AggregatorFactory<?> parent, Builder subFactoriesBuilder) throws IOException {
return new CardinalityAggregatorFactory(name, config, precisionThreshold, context, parent, subFactoriesBuilder, metaData);
}
@Override
public XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException {
if (precisionThreshold != null) {
builder.field(PRECISION_THRESHOLD_FIELD.getPreferredName(), precisionThreshold);
}
return builder;
}
@Override
protected int innerHashCode() {
return Objects.hash(precisionThreshold);
}
@Override
protected boolean innerEquals(Object obj) {
CardinalityAggregationBuilder other = (CardinalityAggregationBuilder) obj;
return Objects.equals(precisionThreshold, other.precisionThreshold);
}
@Override
public String getType() {
return NAME;
}
}
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